Study on Air Cooled Heat Exchanger with Corrugated Fin Surfaces : 1st Report. Fin Efficiency and Overall Efficiency of Straight Fin Surfaces.

抄録

Fin efficiency and overall efficiency are very important factors to be considered in the design of finned heat exchangers. However, no suitable equation has been available to compute the efficiency of the fin surfaces, where heat conduction proceeds two-dimensionally through a thin strip and is influenced by heat conduction characteristics of the water tube walls. In this paper, equations for the fin efficiency and overall efficiency are presented for the following three cases. First, the approximate equation for fin efficiency, derived from numerical analysis in case of two-dimensional heat conduction through thin metal fins. Second, the equation for fin overall efficiency in consideration of heat conduction characteristics of the water tube walls, derived by analysis. Third, the equation for corrugated fin surface's overall efficiency derived from consideration of the influence of two-dimensional heat conduction through the fins and heat conduction characteristics of the water tube walls.